docs: def one_phase_dP(m, rho, mu, D, roughness=0, L=1, Method=None):
      r'''Calculates single-phase pressure drop. This is a wrapper
      around other methods.
  
      Parameters
      ----------
      m : float
          Mass flow rate of fluid, [kg/s]
      rho : float
          Density of fluid, [kg/m^3]
      mu : float
          Viscosity of fluid, [Pa*s]
      D : float
          Diameter of pipe, [m]
      roughness : float, optional
          Roughness of pipe for use in calculating friction factor, [m]
      L : float, optional
          Length of pipe, [m]
      Method : string, optional
          A string of the function name to use
  
      Returns
      -------
      dP : float
          Pressure drop of the single-phase flow, [Pa]
  
      Notes
      -----
  
      Examples
      --------
      >>> one_phase_dP(10.0, 1000, 1E-5, .1, L=1)
      63.43447321097365
      
      References
      ----------
      .. [1] Crane Co. Flow of Fluids Through Valves, Fittings, and Pipe. Crane,
         2009.
      '''
      D2 = D*D
      V = m/(0.25*pi*D2*rho)
      Re = Reynolds(V=V, rho=rho, mu=mu, D=D)
      fd = friction_factor(Re=Re, eD=roughness/D, Method=Method)
      dP = fd*L/D*(0.5*rho*V*V)
      return dP